CVE-2018-6789
Summary
| CVE | CVE-2018-6789 |
|---|---|
| State | PUBLIC |
| Assigner | [email protected] |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2018-02-08 23:29:00 UTC |
| Updated | 2021-06-03 18:15:00 UTC |
| Description | An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely. |
Risk And Classification
EPSS: 0.864390000 probability, percentile 0.994130000 (date 2026-04-17)
CISA KEV: Listed on 2021-11-03; due 2022-05-03; ransomware use Known
Problem Types: CWE-119
CISA Known Exploited Vulnerability
| Vendor | Exim |
|---|---|
| Product | Exim |
| Name | Exim Buffer Overflow Vulnerability |
| Required Action | Apply updates per vendor instructions. |
| Notes | https://nvd.nist.gov/vuln/detail/CVE-2018-6789 |
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Canonical | Ubuntu Linux | 14.04 | All | All | All |
| Operating System | Canonical | Ubuntu Linux | 16.04 | All | All | All |
| Operating System | Canonical | Ubuntu Linux | 17.10 | All | All | All |
| Operating System | Canonical | Ubuntu Linux | 14.04 | All | All | All |
| Operating System | Canonical | Ubuntu Linux | 16.04 | All | All | All |
| Operating System | Canonical | Ubuntu Linux | 17.10 | All | All | All |
| Operating System | Debian | Debian Linux | 7.0 | All | All | All |
| Operating System | Debian | Debian Linux | 8.0 | All | All | All |
| Operating System | Debian | Debian Linux | 9.0 | All | All | All |
| Operating System | Debian | Debian Linux | 7.0 | All | All | All |
| Operating System | Debian | Debian Linux | 8.0 | All | All | All |
| Operating System | Debian | Debian Linux | 9.0 | All | All | All |
| Application | Exim | Exim | All | All | All | All |
| Application | Exim | Exim | All | All | All | All |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| oss-security - Exim 4.90.1 released. (Was: CVE-2018-6789 Exim 4.90 and earlier: buffer overflow) | CONFIRM | openwall.com | Mailing List, Third Party Advisory |
| [SECURITY] [DLA 1274-1] exim4 security update | MLIST | lists.debian.org | Mailing List, Third Party Advisory |
| Exim base64d Buffer Overflow ≈ Packet Storm | MISC | packetstormsecurity.com | |
| Exim 'base64d()' Function Buffer Overflow Vulnerability | BID | www.securityfocus.com | Third Party Advisory, VDB Entry |
| oss-security - CVE-2018-6789 Exim 4.90 and earlier: buffer overflow | MLIST | www.openwall.com | Mailing List, Third Party Advisory |
| Exim Buffer Overflow in base64d() Lets Remote Users Execute Arbitrary Code - SecurityTracker | SECTRACK | www.securitytracker.com | Third Party Advisory, VDB Entry |
| USN-3565-1: Exim vulnerability | Ubuntu security notices | UBUNTU | usn.ubuntu.com | Third Party Advisory |
| Exim Off-by-one RCE: Exploiting CVE-2018-6789 with Fully Mitigations Bypassing | DEVCORE | MISC | devco.re | Technical Description, Third Party Advisory |
| git.exim.org Git - exim.git/commit | CONFIRM | git.exim.org | Patch, Vendor Advisory |
| exim 4.90 - Remote Code Execution - Linux remote Exploit | EXPLOIT-DB | www.exploit-db.com | Exploit, Third Party Advisory, VDB Entry |
| Exim < 4.90.1 - 'base64d' Remote Code Execution - Linux remote Exploit | EXPLOIT-DB | www.exploit-db.com | Exploit, Third Party Advisory, VDB Entry |
| Debian -- Security Information -- DSA-4110-1 exim4 | DEBIAN | www.debian.org | Third Party Advisory |
| exim.org/static/doc/security/CVE-2018-6789.txt | CONFIRM | exim.org | Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
| CISA Known Exploited Vulnerabilities catalog | CISA | www.cisa.gov | kev |
No vendor comments have been submitted for this CVE.